Combine graham cracker crumbs, sugar and butter in a mixing bowl, stirring well to blend. Press into a 9-inch cake pan and bake in preheated oven to 180ºC for 10 minutes. Set aside to cool.
In a medium saucepan, combine marsmallow, milk and chopped chocolates. Cook over medium heat, stirring until mixture melt well together. Chill until mixture thickens.
Beat cream until stiff. Fold in marshmallow mixture. Spoon filling into prepared crust. Refrigerate to chill well, about 4-5 hours and to become firm before serving.
Cover with whipped cream and top it with shaved chocolate, if you want... or any topping you desired.
Serve, share and enjoy its deliciousness.